Originally Posted by

**^_^Engineer_Adam^_^** i am not sure what to do because this problem has two origins which is not discussed in my electromagnetics book:

cyl coordiinates (rho,phi,z)

Given:

$\displaystyle \vec{A} = 3\vec{a}_{\rho A} + 5\vec{a}_{\phi A} + 2\vec{a}_{zA} $ at point (5, 30 degrees, 7)

$\displaystyle \vec{B} = 5\vec{a}_{\rho B} + 5\vec{a}_{\phi B} + 2\vec{a}_{zB} $ at point (2, 45 degrees, 7)

Find:

$\displaystyle \vec{A} dot \vec{B}$

$\displaystyle \vec{A} + \vec{B}$

$\displaystyle \vec{A} X \vec{B}$

can you do at least one, (hardest which is cross product)

thanks